foam flying through the vents but no steam? Good chance is that the foam has deteriorated off the flappy door bits leaving great holes exposed for the hot air to escape. Its not necessary to replace the heater core if this is the case, just dismantle the lower part of your dash and pull the vent off the front of the heater box. once this is done go about patching up the foamless doors with ur choice of race-tape or replacement foam. Before reassembling check both ur heat sliders to see that nothing is jammed and voila! problem fixed. The worst part is disassembling it the first time, it is a little tight but you will get there with persistance. Can be done in under an hour easy
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